Refactor AppWindow to remove showInTaskbar property and improve

[rgdevment]

• Removed the showInTaskbar property from AppWindow class.
• Updated window initialization to always skip taskbar on Windows and added visibility handling for macOS.
• Refactored visibility logic in hide and exitGateMode methods.
• Adjusted logging to reflect changes in taskbar behavior.

Enhance WindowFocusManager to improve focus handling and diagnostics

• Introduced focus repair diagnostics in WindowFocusManager.
• Added methods to track and verify keyboard focus before pasting.
• Improved error handling for focus-related issues during paste operations.

Update WindowsHotkeyChannel to support focus and thread diagnostics

• Modified sendPaste method to accept target window and focus parameters.
• Enhanced response structure to include focus repair diagnostics.

Improve SQLite database management for security and performance

• Changed auto_vacuum pragma to secure_delete for better data handling.
• Implemented incremental vacuuming to maintain database performance.

Add permission restrictions for Linux storage directories

• Implemented _restrictToOwner method to set directory permissions to 0700 on Linux.

Enhance ClipboardService to prevent overwriting stale entries

• Added logic to check for the existence of stored images before reactivating clipboard items.

Refactor ListenerPlugin for better activation tracking on macOS

• Implemented activation tracking to capture the last foreign application bundle ID.
• Improved paste handling to ensure focus is correctly managed during paste operations.

Fix clipboard handling in Windows ListenerPlugin

• Added retry logic for OpenClipboard to handle brief locks by other applications.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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